155906857 has 4 divisors (see below), whose sum is σ = 162685440. Its totient is φ = 149128276.

The previous prime is 155906827. The next prime is 155906869. The reversal of 155906857 is 758609551.

155906857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 155906857 - 2²³ = 147518249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155906827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3389257 + ... + 3389302.

It is an arithmetic number, because the mean of its divisors is an integer number (40671360).

Almost surely, 2^155906857 is an apocalyptic number.

It is an amenable number.

155906857 is a deficient number, since it is larger than the sum of its proper divisors (6778583).

155906857 is an equidigital number, since it uses as much as digits as its factorization.

155906857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6778582.

The product of its (nonzero) digits is 378000, while the sum is 46.

The square root of 155906857 is about 12486.2667358983. The cubic root of 155906857 is about 538.2141012947.

The spelling of 155906857 in words is "one hundred fifty-five million, nine hundred six thousand, eight hundred fifty-seven".